Sarah, please let me know if you feel the test was screwed by laptop-mode-tools kicking in, although I believed they were not running while I was on AC power. I was testing under these conditions: vostro ~ # grep . /sys/bus/pci/devices/*/power/control /sys/bus/pci/devices/0000:00:00.0/power/control:auto /sys/bus/pci/devices/0000:00:02.0/power/control:auto /sys/bus/pci/devices/0000:00:16.0/power/control:auto /sys/bus/pci/devices/0000:00:1a.0/power/control:auto /sys/bus/pci/devices/0000:00:1b.0/power/control:auto /sys/bus/pci/devices/0000:00:1c.0/power/control:auto /sys/bus/pci/devices/0000:00:1c.1/power/control:auto /sys/bus/pci/devices/0000:00:1c.3/power/control:auto /sys/bus/pci/devices/0000:00:1c.4/power/control:auto /sys/bus/pci/devices/0000:00:1c.7/power/control:auto /sys/bus/pci/devices/0000:00:1d.0/power/control:auto /sys/bus/pci/devices/0000:00:1f.0/power/control:auto /sys/bus/pci/devices/0000:00:1f.2/power/control:auto /sys/bus/pci/devices/0000:00:1f.3/power/control:auto /sys/bus/pci/devices/0000:05:00.0/power/control:auto /sys/bus/pci/devices/0000:09:00.0/power/control:auto /sys/bus/pci/devices/0000:0b:00.0/power/control:auto /sys/bus/pci/devices/0000:11:00.0/power/control:auto vostro ~ # grep . /sys/bus/pci/devices/*/power/runtime_status /sys/bus/pci/devices/0000:00:00.0/power/runtime_status:suspended /sys/bus/pci/devices/0000:00:02.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:16.0/power/runtime_status:suspended /sys/bus/pci/devices/0000:00:1a.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1b.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.0/power/runtime_status:suspended /sys/bus/pci/devices/0000:00:1c.1/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.3/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.4/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.7/power/runtime_status:active /sys/bus/pci/devices/0000:00:1d.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1f.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1f.2/power/runtime_status:active /sys/bus/pci/devices/0000:00:1f.3/power/runtime_status:suspended /sys/bus/pci/devices/0000:05:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:09:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:0b:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:11:00.0/power/runtime_status:active vostro ~ # My apologies if that twisted the test and thanks for you detailed explanations. I will spot below, however, a few questions. Sarah Sharp wrote: > On Fri, Mar 29, 2013 at 04:05:54PM +0100, Martin Mokrejs wrote: > >> Nevertheless, I went to check if if the USB3 socket dies after first unplug of device >> or not anymore thanks to the patch being tested: >> >> I plugged into the USB3.0 socket a mouse, it worked. Around its unplug I got: >> >> [ 94.954779] hub 3-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100 >> [ 94.954795] hub 3-0:1.0: hub_suspend >> [ 94.954802] usb usb3: bus auto-suspend, wakeup 1 >> [ 94.954817] xhci_hcd 0000:0b:00.0: xhci_hub_status_data: stopping port polling. >> [ 94.954835] xhci_hcd 0000:0b:00.0: xhci_suspend: stopping port polling. >> [ 94.954857] xhci_hcd 0000:0b:00.0: // Setting command ring address to 0xd6007001 >> [ 94.954898] xhci_hcd 0000:0b:00.0: hcd_pci_runtime_suspend: 0 >> [ 94.954983] xhci_hcd 0000:0b:00.0: PME# enabled >> [ 169.622513] hub 2-1:1.0: state 7 ports 8 chg 0000 evt 0004 >> [ 169.623057] hub 2-1:1.0: port 2, status 0101, change 0001, 12 Mb/s >> [ 169.777012] hub 2-1:1.0: debounce: port 2: total 100ms stable 100ms status 0x101 >> [ 169.856992] usb 2-1.2: new low-speed USB device number 4 using ehci-pci >> >> and the port was dead, no matter what "lsusb -v or -vv" options I tried. At about >> [ 169.622513] I plugged the mouse into a USB2.0 socket (do not know if that is 1a.0 or 1d.0). > > All right, I wonder if the USB core/xHCI driver is forgetting to clear a > port status change bit after the device is unplugged. That can cause > the xHCI host to not give us a port status change event later (and thus > no PME). Looking at the logs later, it doesn't seem like we do this > though. > >> If I run lsusb -vv it does (with the problematic patch): >> >> [ 1760.414086] pcieport 0000:00:1c.4: PME# disabled >> [ 1760.434314] xhci_hcd 0000:0b:00.0: PME# disabled >> [ 1760.434327] xhci_hcd 0000:0b:00.0: enabling bus mastering >> [ 1760.434338] xhci_hcd 0000:0b:00.0: // Setting command ring address to 0xd6007001 >> [ 1760.434360] xhci_hcd 0000:0b:00.0: Port Status Change Event for port 2 > > Ok, so the xHCI driver *is* getting a port status change event, and thus > must have gotten a PME. So the PCI layer is doing its job. > >> [ 1760.434363] xhci_hcd 0000:0b:00.0: resume root hub >> [ 1760.434367] xhci_hcd 0000:0b:00.0: handle_port_status: starting port polling. >> [ 1760.434378] xhci_hcd 0000:0b:00.0: xhci_resume: starting port polling. >> [ 1760.434383] xhci_hcd 0000:0b:00.0: hcd_pci_runtime_resume: 0 >> [ 1760.434388] usb usb3: usb auto-resume >> [ 1760.434407] hub 3-0:1.0: hub_resume >> [ 1760.434439] xhci_hcd 0000:0b:00.0: get port status, actual port 0 status = 0x2a0 >> [ 1760.434440] xhci_hcd 0000:0b:00.0: Get port status returned 0x100 >> [ 1760.434464] xhci_hcd 0000:0b:00.0: get port status, actual port 1 status = 0x202a0 >> [ 1760.434465] xhci_hcd 0000:0b:00.0: Get port status returned 0x10100 >> [ 1760.434492] xhci_hcd 0000:0b:00.0: clear port connect change, actual port 1 status = 0x2a0 > > Odd. The port status shows there's no device connected, but there was a > connect change: > > sarah@xanatos:~$ ./decode-port-status 0x202a0 > port status = 0x0202a0 > bit 0 (CCS) 0x0, device not connected > bit 1 (PED) 0x0, port disabled > bit 3 (OCA) 0x0, no over-current condition > bit 4 (PR) 0x0, port not in reset > bits 8:5 (PLS) 0x5, link is in the RxDetect state > bit 9 (PP) 0x1, port power on > bits 13:10 (speed) 0x0, Undefined > bits 15:14 (indicators) 0x0, port indicators are off > bit 17 (CSC) 0x1, connect change > bit 18 (PEC) 0x0, no port enable/disable change > bit 19 (WRC) 0x0, no warm port reset change > bit 20 (OCC) 0x0, no over-current change > bit 21 (PRC) 0x0, no port reset change > bit 22 (PLC) 0x0, no port link change > bit 23 (CEC) 0x0, no port config error change > bit 25 (WCE) 0x0, wake on connect disabled > bit 26 (WDE) 0x0, wake on disconnect disabled > bit 27 (WOE) 0x0, wake on over-current enable disabled > bit 30 (DR) 0x0, device is permanently attached > > RxDetect is the "I'm looking for a USB device" port state. > >> [ 1760.434642] usb usb4: usb wakeup-resume >> [ 1760.434646] usb usb4: usb auto-resume >> [ 1760.434661] hub 4-0:1.0: hub_resume >> [ 1760.434683] xhci_hcd 0000:0b:00.0: get port status, actual port 0 status = 0x2a0 >> [ 1760.434684] xhci_hcd 0000:0b:00.0: Get port status returned 0x2a0 >> [ 1760.434710] xhci_hcd 0000:0b:00.0: get port status, actual port 1 status = 0x2a0 >> [ 1760.434711] xhci_hcd 0000:0b:00.0: Get port status returned 0x2a0 >> [ 1760.434727] hub 4-0:1.0: state 7 ports 2 chg 0000 evt 0000 >> [ 1760.434757] xhci_hcd 0000:0b:00.0: set port remote wake mask, actual port 0 status = 0xe0002a0 >> [ 1760.434784] xhci_hcd 0000:0b:00.0: set port remote wake mask, actual port 1 status = 0xe0002a0 >> [ 1760.434791] hub 4-0:1.0: hub_suspend >> [ 1760.434796] usb usb4: bus auto-suspend, wakeup 1 >> [ 1760.434807] xhci_hcd 0000:0b:00.0: xhci_hub_status_data: stopping port polling. >> [ 1760.553734] xhci_hcd 0000:0b:00.0: xhci_hub_status_data: stopping port polling. >> [ 1760.553751] hub 3-0:1.0: state 7 ports 2 chg 0000 evt 0000 >> [ 1760.574793] xhci_hcd 0000:0b:00.0: get port status, actual port 0 status = 0x2a0 >> [ 1760.574794] xhci_hcd 0000:0b:00.0: Get port status returned 0x100 >> [ 1760.575300] xhci_hcd 0000:0b:00.0: get port status, actual port 1 status = 0x2a0 >> [ 1760.575301] xhci_hcd 0000:0b:00.0: Get port status returned 0x100 > > sarah@xanatos:~$ ./decode-port-status 0x2a0 > port status = 0x0002a0 > bit 0 (CCS) 0x0, device not connected > bit 1 (PED) 0x0, port disabled > bit 3 (OCA) 0x0, no over-current condition > bit 4 (PR) 0x0, port not in reset > bits 8:5 (PLS) 0x5, link is in the RxDetect state > bit 9 (PP) 0x1, port power on > bits 13:10 (speed) 0x0, Undefined > bits 15:14 (indicators) 0x0, port indicators are off > bit 17 (CSC) 0x0, no connect change > bit 18 (PEC) 0x0, no port enable/disable change > bit 19 (WRC) 0x0, no warm port reset change > bit 20 (OCC) 0x0, no over-current change > bit 21 (PRC) 0x0, no port reset change > bit 22 (PLC) 0x0, no port link change > bit 23 (CEC) 0x0, no port config error change > bit 25 (WCE) 0x0, wake on connect disabled > bit 26 (WDE) 0x0, wake on disconnect disabled > bit 27 (WOE) 0x0, wake on over-current enable disabled > bit 30 (DR) 0x0, device is permanently attached > > Nope, your host really isn't reporting there's a device connected > *at all*. That's just broken hardware, and there's really nothing > software can do if the hardware isn't reporting connect events, even > with polling. > > It also doesn't sound like the other TI redriver bug. That bug only > effected USB 3.0 ports, and when lsusb was run, we would find the port > in Compliance Mode. This is the host simply not reporting the USB 2.0 > port connect at all. > > Maybe if we completely disable PCI runtime PM for your host, we can work > around this bug? I am not sure I understand what you mean. The proposed patch makes the situation worse. To be able to use the xHCI port for second and later times, I have to plugin a device and run 'lsusb -vv' to get the device detected before the "port" falls asleep. This is NOT necessary for the SandyBridge USB2.0 port under same conditions (well, regarding the disclaimer I made on the very top of this message, from the other thread where Ying found that I had laptop-mode-tools installed I realized that laptop-mode-tools fiddled with xHCI port while NOT with EHCI port. Please correct me if I was wrong. So, please re-consider your above conclusions. Most importantly, I don not understand the "This is the host simply not reporting the USB 2.0 port connect at all.". Did you mean "USB 3.0 instead"? Other than that, I am ready to file a bug report to Dell's Pro Support site but from my last experience they were quite clue-less regarding the broken "express card PresDet detection". ;-) I bet they could replace the TexasInstruments USB3.0 card which is a separate thing in the laptop. At least I could get the TI hardware which has hopefully fixed the redriver. ;-) How could I reproduce the issue in Win7 which are on the laptop? I mean, the change the PM handling to reproduce what I got on linux under laptop-mode-tools? ;) > > Can you send me the output of `sudo lspci -vvv -n` again? Will send after I reboot into a clean state and re-test the behavior while laptop-mode-tools are gone. Maybe the issue will remain anyways. So so far I tested effectively as under: echo auto > /sys/bus/pci/devices/0000:0b:00.0/power/control and without laptop-mode-tools trickery I should be now testing under echo on > /sys/bus/pci/devices/0000:0b:00.0/power/control , right? Thank you, Martin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
